JP5533562B2 - In-cylinder pressure control system for diesel engine - Google Patents

In-cylinder pressure control system for diesel engine Download PDF

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JP5533562B2
JP5533562B2 JP2010242484A JP2010242484A JP5533562B2 JP 5533562 B2 JP5533562 B2 JP 5533562B2 JP 2010242484 A JP2010242484 A JP 2010242484A JP 2010242484 A JP2010242484 A JP 2010242484A JP 5533562 B2 JP5533562 B2 JP 5533562B2
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cylinder pressure
pressure
diesel engine
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cylinder
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JP2012092784A (en
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朝幸 伊藤
知宏 菅野
義幸 阿部
章 飯島
由加利 水島
治世 木村
功 橘川
直樹 石橋
翔吾 坂下
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Isuzu Motors Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Description

本発明は、ディーゼルエンジンの筒内圧制御システムに関するものである。   The present invention relates to an in-cylinder pressure control system for a diesel engine.

車両に搭載されるディーゼルエンジンにおいては、低燃費化及び軽量化を図るために、ダウンサイジング化が図られている。一方、ダウンサイジング化に伴う出力の低下を補うべく馬力を上げる必要性から筒内圧（燃焼爆発時の圧力）を上げると、耐久性の低下を来す問題があることから、エンジンのいかなる状況でも筒内圧が最大値を超えないように設定されると共に、筒内の低圧縮比化も図られている。   In a diesel engine mounted on a vehicle, downsizing is attempted in order to reduce fuel consumption and weight. On the other hand, increasing the in-cylinder pressure (pressure at the time of combustion explosion) due to the need to increase horsepower to compensate for the decrease in output due to downsizing has the problem of reducing durability, so in any situation of the engine The in-cylinder pressure is set so as not to exceed the maximum value, and the in-cylinder compression ratio is reduced.

ただ、筒内の低圧縮比化は、シリンダ、ピストン、燃焼室で構成される内燃室の圧縮比を低くすることから、圧縮端温度が低下し、白煙が発生しやすくなる。そのため、前記白煙の発生を防止すべく、前記圧縮比が高めに設定される。なお、筒内の圧縮比を制御する技術としては、例えばディーゼルエンジンの圧縮比可変システム（特許文献１参照）が知られている。   However, lowering the compression ratio in the cylinder lowers the compression ratio of the internal combustion chamber composed of the cylinder, piston, and combustion chamber, so that the compression end temperature decreases and white smoke tends to be generated. Therefore, the compression ratio is set high to prevent the generation of white smoke. As a technique for controlling the in-cylinder compression ratio, for example, a diesel engine variable compression ratio system (see Patent Document 1) is known.

特開平５−２９６０６１号公報JP-A-5-296061

ところで、前記筒内圧の最大値の数値は、かなりのマージンを持っており、ある条件では筒内圧にかなりの余裕を持っている場合があり、エンジンのパフォーマンス（例えば馬力）を最大に生かすことができなかった。なお、筒内圧が規定値を超えると耐久性及び信頼性の低下を来す問題がある。   By the way, the numerical value of the maximum value of the in-cylinder pressure has a considerable margin, and under certain conditions, the in-cylinder pressure may have a considerable margin, and the engine performance (for example, horsepower) may be maximized. could not. If the in-cylinder pressure exceeds a specified value, there is a problem that durability and reliability are lowered.

本発明は、前記事情を考慮してなされたものであり、いかなる運転状況でも筒内圧を適切にコントロールすることができ、エンジンのパフォーマンスを最大に生かすことができると共に耐久性及び信頼性の向上が図れるディーゼルエンジンの筒内圧制御システムを提供することを目的とする。   The present invention has been made in consideration of the above circumstances, and can appropriately control the in-cylinder pressure in any operating condition, maximize the performance of the engine, and improve durability and reliability. An object of the present invention is to provide an in-cylinder pressure control system for a diesel engine.

前記目的を達成するために、本発明は、低圧縮比化されたディーゼルエンジンの筒内圧制御システムであって、前記ディーゼルエンジンにモータ発電機を有する電動ターボチャージャを搭載すると共に、前記ディーゼルエンジンの筒内圧を検出する筒内圧センサを設け、該筒内圧センサにより検出された検出筒内圧を吸入空気量と過給圧と燃料噴射タイミングとの関係から予めマップとして設定された設定筒内圧と比較して、検出筒内圧が設定筒内圧よりも低いときには筒内圧を上げるべく前記電動ターボチャージャを前記モータ発電機のモータ機能により駆動させて過給圧を上げ、検出筒内圧が設定筒内圧よりも高いときには筒内圧を下げるべく前記電動ターボチャージャを前記モータ発電機の発電機機能により制動回生させて過給圧を下げるように構成されていることを特徴とする。   In order to achieve the above object, the present invention provides an in-cylinder pressure control system for a diesel engine with a low compression ratio, in which an electric turbocharger having a motor generator is mounted on the diesel engine, and the diesel engine An in-cylinder pressure sensor for detecting the in-cylinder pressure is provided, and the detected in-cylinder pressure detected by the in-cylinder pressure sensor is compared with a set in-cylinder pressure set in advance as a map from the relationship between the intake air amount, the supercharging pressure, and the fuel injection timing. Thus, when the detected in-cylinder pressure is lower than the set in-cylinder pressure, the electric turbocharger is driven by the motor function of the motor generator to increase the in-cylinder pressure, and the supercharging pressure is increased, and the detected in-cylinder pressure is higher than the set in-cylinder pressure. Sometimes, to reduce the in-cylinder pressure, the electric turbocharger is braked and regenerated by the generator function of the motor generator to lower the boost pressure. Characterized in that it is configured so that.

本発明によれば、いかなる運転状況でも筒内圧を適切にコントロールすることができ、エンジンのパフォーマンスを最大に生かすことができると共にエンジンの耐久性及び信頼性の向上が図れる。   According to the present invention, the in-cylinder pressure can be appropriately controlled in any operating condition, the engine performance can be maximized, and the durability and reliability of the engine can be improved.

本発明の実施形態に係るディーゼルエンジンの筒内圧制御システムを概略的に示す図である。It is a figure showing roughly the cylinder pressure control system of the diesel engine concerning the embodiment of the present invention. 筒内圧制御システムの作用を説明するフローチャートである。It is a flowchart explaining the effect | action of a cylinder pressure control system.

以下に、本発明を実施するための形態を添付図面に基いて詳述する。   EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is explained in full detail based on an accompanying drawing.

図１において、１は車両（図示省略）に搭載されるディーゼルエンジンで、そのエンジン本体１ａの一側に吸気マニホールド２が、他側に排気マニホールド３がそれぞれ設けられている。前記吸気マニホールド２には吸気通路４が接続され、この吸気通路４の上流端には図示しないエアクリーナが設けられている。また、前記排気マニホールド３には排気通路５が接続され、この排気通路５の下流端には図示しない後処理装置を介してマフラが設けられている。   In FIG. 1, reference numeral 1 denotes a diesel engine mounted on a vehicle (not shown). An intake manifold 2 is provided on one side of the engine body 1a and an exhaust manifold 3 is provided on the other side. An intake passage 4 is connected to the intake manifold 2, and an air cleaner (not shown) is provided at the upstream end of the intake passage 4. An exhaust passage 5 is connected to the exhaust manifold 3, and a muffler is provided at the downstream end of the exhaust passage 5 via a post-processing device (not shown).

前記ディーゼルエンジン１には吸気を加給するための電動ターボチャージャ（以下、電動ターボともいう）６が搭載されている。この電動ターボ６は、前記排気通路５に設けられ排気圧力により回転駆動されるタービン７と、吸気通路４に設けられ吸気を加圧するコンプレッサ８と、タービン７の動力をコンプレッサ８に伝達すべくこれらタービン７とコンプレッサ８を接続する回転軸９と、この回転軸９を回転駆動することが可能であり且つ制動回生することも可能なモータ発電機１０とを備えている。前記モータ発電機１０はインバータ１１を介してバッテリ１２に接続されている。また、電動ターボ６のモータ発電機１０は、後述のＥＣＵ１３によりインバータ１１を介して制御されるようになっている。   The diesel engine 1 is equipped with an electric turbocharger (hereinafter also referred to as an electric turbo) 6 for supplying intake air. The electric turbo 6 includes a turbine 7 that is provided in the exhaust passage 5 and is driven to rotate by exhaust pressure, a compressor 8 that is provided in the intake passage 4 and pressurizes intake air, and transmits the power of the turbine 7 to the compressor 8. A rotating shaft 9 that connects the turbine 7 and the compressor 8 is provided, and a motor generator 10 that can rotationally drive the rotating shaft 9 and can also perform brake regeneration. The motor generator 10 is connected to a battery 12 via an inverter 11. Further, the motor generator 10 of the electric turbo 6 is controlled by an ECU 13 described later via an inverter 11.

前記コンプレッサ８よりも下流の吸気通路４にはインタークーラ１４が設けられている。このインタークーラ１４よりも下流の吸気通路４とタービン７よりも上流の排気通路５とは排気を吸気側に還流して排気ガス中のＮｏｘの低減を図るためのＥＧＲ通路１５で接続され、このＥＧＲ通路１５にはＥＧＲ弁１６及びＥＧＲクーラー１７が設けられている。   An intercooler 14 is provided in the intake passage 4 downstream of the compressor 8. The intake passage 4 downstream of the intercooler 14 and the exhaust passage 5 upstream of the turbine 7 are connected by an EGR passage 15 for returning exhaust gas to the intake side to reduce Nox in the exhaust gas. An EGR valve 16 and an EGR cooler 17 are provided in the EGR passage 15.

前記ディーゼルエンジン１は、ダウンサイジングされていると共に低圧縮比化されている。このディーゼルエンジン１には、低圧縮比化されているが故に発生し易い白煙を防止すると共にいかなる運転状況でも筒内圧を適切にコントロールするための筒内圧制御システムが組み込まれたエンジンコントロールユニット（ＥＣＵ）１３が搭載されている。   The diesel engine 1 is downsized and has a low compression ratio. The diesel engine 1 has an in-cylinder pressure control system (in-cylinder pressure control system) for preventing white smoke that is likely to be generated due to a low compression ratio and for appropriately controlling the in-cylinder pressure in any operating condition. ECU) 13 is mounted.

前記筒内圧制御システムは、前記筒内圧センサ１８により検出された筒内圧（検出筒内圧）を吸入空気量と過給圧と燃料噴射タイミングとの関係で予め設定された筒内圧（設定筒内圧）と比較して、検出筒内圧が設定筒内圧よりも低いときには筒内圧を上げるべく前記電動ダーボ６を前記モータ発電機１０のモータ機能により駆動させて過給圧（ブースト圧）を上げ、検出筒内圧が設定筒内圧よりも高いときには筒内圧を下げるべく前記電動ターボ１６を前記モータ発電機１０の発電機機能により制動回生させて過給圧を下げるように構成されている。   The in-cylinder pressure control system is configured such that the in-cylinder pressure detected by the in-cylinder pressure sensor 18 (detected in-cylinder pressure) is preset in relation to the intake air amount, the supercharging pressure, and the fuel injection timing (set in-cylinder pressure). When the detection cylinder internal pressure is lower than the set cylinder internal pressure, the electric darbo 6 is driven by the motor function of the motor generator 10 to increase the cylinder internal pressure to increase the supercharging pressure (boost pressure). When the internal pressure is higher than the set in-cylinder pressure, the electric turbo 16 is braked and regenerated by the generator function of the motor generator 10 so as to reduce the in-cylinder pressure, thereby reducing the supercharging pressure.

具体的には、図２に示すように、前記筒内圧センサ１８により筒内圧を直接検出し（Ｓ１）、次にその検出筒内圧が予め設定された設定筒内圧以内か否かを判定し（Ｓ２）、検出筒内圧が設定筒内圧以内であるときには電動ターボ６をモータ発電機１０のモータ機能により駆動させて過給圧を上げ（Ｓ３）、推定筒内圧が設定筒内圧を超えるときには電動ターボ６をモータ発電機１０の発電機機能により制動回生させて過給圧を下げる（Ｓ４）ように構成されている。   Specifically, as shown in FIG. 2, the in-cylinder pressure is directly detected by the in-cylinder pressure sensor 18 (S1), and then it is determined whether or not the detected in-cylinder pressure is within a preset in-cylinder pressure ( S2) When the detected in-cylinder pressure is within the set in-cylinder pressure, the electric turbo 6 is driven by the motor function of the motor generator 10 to increase the supercharging pressure (S3). When the estimated in-cylinder pressure exceeds the set in-cylinder pressure, the electric turbo 6 is braked and regenerated by the generator function of the motor generator 10 to lower the supercharging pressure (S4).

すなわち、検出筒内圧が設定筒内圧を超えているときには、排気圧力によるタービン７の回転力をモータ発電機１０の駆動（発電）に用いるため、コンプレッサ８の回転力が抑制され、過給圧を下げて筒内圧を下げることができると共に、発電により生じた電気をバッテリ１２に蓄えることができ、省エネルギ化を図ることができる。   That is, when the detected in-cylinder pressure exceeds the set in-cylinder pressure, the rotational force of the turbine 7 due to the exhaust pressure is used for driving (power generation) of the motor generator 10, so the rotational force of the compressor 8 is suppressed and the boost pressure is reduced. The in-cylinder pressure can be reduced by lowering, and the electricity generated by the power generation can be stored in the battery 12 to save energy.

以上の構成からなるディーゼルエンジン１の筒内圧制御システムによれば、低圧縮比化されたディーゼルエンジン１の筒内圧制御システムであって、前記ディーゼルエンジン１にモータ発電機１０を有する電動ターボ６を搭載すると共に、前記ディーゼルエンジン１の筒内圧を検出する筒内圧センサ１８を設け、該筒内圧センサ１８により検出された検出筒内圧を吸入空気量と過給圧と燃料噴射タイミングとの関係で予め設定された設定筒内圧と比較して、検出筒内圧が設定筒内圧よりも低いときには筒内圧を上げるべく前記電動ターボ６を前記モータ発電機１０のモータ機能により駆動し、検出筒内圧が設定筒内圧よりも高いときには筒内圧を下げるべく前記電動ターボ６を前記モータ発電機１０の発電機機能により制動回生するように構成されているため、いかなる運転状況でも筒内圧を設定圧力になるよう適切にコントロールすることができ、エンジンのパフォーマンスを最大に生かすことができると共にエンジンの耐久性及び信頼性の向上が図れる。   According to the in-cylinder pressure control system of the diesel engine 1 having the above-described configuration, the in-cylinder pressure control system of the diesel engine 1 having a low compression ratio, the electric turbo 6 having the motor generator 10 in the diesel engine 1 is provided. In-cylinder pressure sensor 18 for detecting the in-cylinder pressure of diesel engine 1 is provided, and the detected in-cylinder pressure detected by in-cylinder pressure sensor 18 is determined in advance in relation to intake air amount, supercharging pressure, and fuel injection timing. When the detected in-cylinder pressure is lower than the set in-cylinder pressure compared to the set in-cylinder pressure, the electric turbo 6 is driven by the motor function of the motor generator 10 to increase the in-cylinder pressure, and the detected in-cylinder pressure is set to the set cylinder pressure. When the pressure is higher than the internal pressure, the electric turbo 6 is braked and regenerated by the generator function of the motor generator 10 in order to lower the cylinder internal pressure. Because it is also possible to suitably control so that the cylinder pressure to the set pressure in any operating conditions, the performance of the engine can be improved durability and reliability of the engine it is possible to utilize the maximum.

以上、本発明の実施の形態を図面により詳述してきたが、本発明は前記実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲での種々の設計変更が可能である。   The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. .

１ ディーゼルエンジン
６ 電動ターボチャージャ
１０ モータ発電機
１３ ＥＣＵ
１８ 筒内圧センサ 1 Diesel engine 6 Electric turbocharger 10 Motor generator 13 ECU
18 In-cylinder pressure sensor

Claims (1)

低圧縮比化されたディーゼルエンジンの筒内圧制御システムであって、前記ディーゼルエンジンにモータ発電機を有する電動ターボチャージャを搭載すると共に、前記ディーゼルエンジンの筒内圧を検出する筒内圧センサを設け、該筒内圧センサにより検出された検出筒内圧を吸入空気量と過給圧と燃料噴射タイミングとの関係で予め設定された設定筒内圧と比較して、検出筒内圧が設定筒内圧よりも低いときには筒内圧を上げるべく前記電動ターボチャージャを前記モータ発電機のモータ機能により駆動させて過給圧を上げ、検出筒内圧が設定筒内圧よりも高いときには筒内圧を下げるべく前記電動ターボチャージャを前記モータ発電機の発電機機能により制動回生させて過給圧を下げるように構成されていることを特徴とするディーゼルエンジンの筒内圧制御システム。   An in-cylinder pressure control system for a diesel engine having a reduced compression ratio, wherein an electric turbocharger having a motor generator is mounted on the diesel engine, and an in-cylinder pressure sensor for detecting an in-cylinder pressure of the diesel engine is provided, When the detected in-cylinder pressure is lower than the set in-cylinder pressure, the detected in-cylinder pressure detected by the in-cylinder pressure sensor is compared with a set in-cylinder pressure set in advance in relation to the intake air amount, the supercharging pressure, and the fuel injection timing. In order to increase the internal pressure, the electric turbocharger is driven by the motor function of the motor generator to increase the supercharging pressure. When the detected in-cylinder pressure is higher than the set in-cylinder pressure, the electric turbocharger Diesel that is configured to reduce the boost pressure by braking regeneration by the generator function of the machine Engine cylinder pressure control system.
JP2010242484A 2010-10-28 2010-10-28 In-cylinder pressure control system for diesel engine Expired - Fee Related JP5533562B2 (en)

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